Add sample PDF with comboboxes.

There are three comboboxes:
1) Normal combobox with pre-selected value.
2) User editable combobox.
3) Read-only combobox, which is actually invisible.

Change-Id: I6bc7955459a11bf043ace7002393c2d7ee8471e9
Reviewed-on: https://pdfium-review.googlesource.com/6770
Reviewed-by: dsinclair <dsinclair@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>

2 files changed, 182 insertions, 0 deletions

diff --git a/testing/resources/combobox_form.in b/testing/resources/combobox_form.in
new file mode 100644
index 0000000000..c64f329f22
--- /dev/null
+++ b/testing/resources/combobox_form.in
@@ -0,0 +1,84 @@
+{{header}}
+{{object 1 0}}
+<<
+  /Type /Catalog
+  /Pages 2 0 R
+  /AcroForm << /Fields [ 8 0 R 9 0 R 10 0 R ] /DR 4 0 R >>
+>>
+endobj
+{{object 2 0}}
+<< /Count 1 /Kids [ 3 0 R ] /Type /Pages >>
+endobj
+{{object 3 0}}
+<<
+  /Type /Page
+  /Parent 2 0 R
+  /Resources 4 0 R
+  /MediaBox [ 0 0 300 300 ]
+  /Contents 7 0 R
+  /Annots [ 8 0 R 9 0 R 10 0 R ]
+>>
+endobj
+{{object 4 0}}
+<< /Font 5 0 R >>
+endobj
+{{object 5 0}}
+<< /F1 6 0 R >>
+endobj
+{{object 6 0}}
+<<
+  /Type /Font
+  /Subtype /Type1
+  /BaseFont /Helvetica
+>>
+{{object 7 0}}
+<< /Length 51 >>
+stream
+BT
+0 0 0 rg
+/F1 12 Tf
+100 150 Td
+(Test Form) Tj
+ET
+endstream
+endobj
+{{object 8 0}}
+<<
+  /Type /Annot
+  /FT /Ch
+  /Ff 393216
+  /T (Combo_Editable)
+  /DA (0 0 0 rg /F1 12 Tf)
+  /Rect [ 100 50 200 80 ]
+  /Subtype /Widget
+  /Opt [[(foo) (Foo)] [(bar) (Bar)] [(qux) (Qux)]]
+>>
+endobj
+{{object 9 0}}
+<<
+  /Type /Annot
+  /FT /Ch
+  /Ff 131072
+  /T (Combo1)
+  /DA (0 0 0 rg /F1 12 Tf)
+  /Rect [ 100 100 200 130 ]
+  /Subtype /Widget
+  /Opt [(Apple) (Banana) (Cherry)]
+  /V (Banana)
+>>
+{{object 10 0}}
+<<
+  /Type /Annot
+  /FT /Ch
+  /Ff 131073
+  /T (Combo_ReadOnly)
+  /DA (0 0 0 rg /F1 12 Tf)
+  /Rect [ 100 200 200 230 ]
+  /Subtype /Widget
+  /Opt [(Dog) (Elephant) (Frog)]
+>>
+endobj
+{{xref}}
+trailer<< /Size 10 /Root 1 0 R >>
+{{startxref}}
+%%EOF
diff --git a/testing/resources/combobox_form.pdf b/testing/resources/combobox_form.pdf
new file mode 100644
index 0000000000..d543737606
--- /dev/null
+++ b/testing/resources/combobox_form.pdf
@@ -0,0 +1,98 @@
+%PDF-1.7
+% ò¤ô
+1 0 obj
+<<
+  /Type /Catalog
+  /Pages 2 0 R
+  /AcroForm << /Fields [ 8 0 R 9 0 R 10 0 R ] /DR 4 0 R >>
+>>
+endobj
+2 0 obj
+<< /Count 1 /Kids [ 3 0 R ] /Type /Pages >>
+endobj
+3 0 obj
+<<
+  /Type /Page
+  /Parent 2 0 R
+  /Resources 4 0 R
+  /MediaBox [ 0 0 300 300 ]
+  /Contents 7 0 R
+  /Annots [ 8 0 R 9 0 R 10 0 R ]
+>>
+endobj
+4 0 obj
+<< /Font 5 0 R >>
+endobj
+5 0 obj
+<< /F1 6 0 R >>
+endobj
+6 0 obj
+<<
+  /Type /Font
+  /Subtype /Type1
+  /BaseFont /Helvetica
+>>
+7 0 obj
+<< /Length 51 >>
+stream
+BT
+0 0 0 rg
+/F1 12 Tf
+100 150 Td
+(Test Form) Tj
+ET
+endstream
+endobj
+8 0 obj
+<<
+  /Type /Annot
+  /FT /Ch
+  /Ff 393216
+  /T (Combo_Editable)
+  /DA (0 0 0 rg /F1 12 Tf)
+  /Rect [ 100 50 200 80 ]
+  /Subtype /Widget
+  /Opt [[(foo) (Foo)] [(bar) (Bar)] [(qux) (Qux)]]
+>>
+endobj
+9 0 obj
+<<
+  /Type /Annot
+  /FT /Ch
+  /Ff 131072
+  /T (Combo1)
+  /DA (0 0 0 rg /F1 12 Tf)
+  /Rect [ 100 100 200 130 ]
+  /Subtype /Widget
+  /Opt [(Apple) (Banana) (Cherry)]
+  /V (Banana)
+>>
+10 0 obj
+<<
+  /Type /Annot
+  /FT /Ch
+  /Ff 131073
+  /T (Combo_ReadOnly)
+  /DA (0 0 0 rg /F1 12 Tf)
+  /Rect [ 100 200 200 230 ]
+  /Subtype /Widget
+  /Opt [(Dog) (Elephant) (Frog)]
+>>
+endobj
+xref
+0 11
+0000000000 65535 f 
+0000000015 00000 n 
+0000000127 00000 n 
+0000000186 00000 n 
+0000000335 00000 n 
+0000000368 00000 n 
+0000000399 00000 n 
+0000000468 00000 n 
+0000000568 00000 n 
+0000000772 00000 n 
+0000000961 00000 n 
+trailer<< /Size 10 /Root 1 0 R >>
+startxref
+1150
+%%EOF